PA CDL COMBINATION TEST - PRACTICE TEST

11. Glad hands are:
coupling devices.
warning devices.
securement devices.
electronic devices.
12. Antifreeze:
helps the engine only under hot conditions.
helps the engine under hot conditions as well as cold conditions.
doesn't help the engine in any way.
helps the engine only when the temperature is below freezing.
13. Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
100 psi
35 psi
150 psi
50 psi
14. If the safety relief valve in the air brake system releases air:
the valve is fully operational.
this will supply more power to the drive wheels.
something is wrong.
this will supply more power to the brakes.
15. After starting the engine, oil pressure should rise to a normal level:
within 2 minutes.
within 3 miles.
within seconds.
within 6 minutes.
16. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line causes:
the trailer spring brakes to come on.
the trailer emergency brakes to come on.
the speed of your vehicle to increase.
All of the above.
17. When uncoupling, after you unlock the fifth-wheel you should:
pull the tractor partially clear of the trailer.
chock the trailer wheels.
ease the pressure on the locking jaws.
pull the tractor clear of the trailer.
18. If your brakes get wet, it can cause them:
to be weak.
to grab.
to apply unevenly.
All of the above.
19. Empty trucks have the best braking. True or False?
True.
It depends on the truck.
False.
It depends on the cargo.
20. You have uncoupled a trailer and want to inspect the landing gear. The tractor should be positioned:
with the tractor frame above the trailer.
with the tractor frame under the trailer.
completely clear of the trailer.
None of the above.
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